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4mm2 twin and earth cable

Former Community Member
Former Community Member
regarding 4mm2 cable was it ever available in the old colours with solid conductors rather than the 7 strands version? Ive just done a pre - inspection of a property before doing an EICR and found 2 radial circuits fed from 32A MCBS. The cables appear to be  larger than 2,5mm2 . I'm going back to inspect this property with a view to reducing the MCB's to 20A if if they are 2.5mm2. I'm also taking  a Vernier  gauge to measure the cable diameters and compare to reference tables.

The installation is approximately 30 years old but is in very good condition.
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    I've a feeling aluminium tended to be solid to a larger size than copper - it's always possible that the cable could be older than the installation (someone had a reel spare...) - it would be very obvious if it was plain Aluminium, so +1 for it possibly being copper clad aluminium. A look at the cut end of the conductor (perhaps after a stroke of a fine file to remove any oxide first) should confirm or deny.

       - Andy.
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    I've a feeling aluminium tended to be solid to a larger size than copper - it's always possible that the cable could be older than the installation (someone had a reel spare...) - it would be very obvious if it was plain Aluminium, so +1 for it possibly being copper clad aluminium. A look at the cut end of the conductor (perhaps after a stroke of a fine file to remove any oxide first) should confirm or deny.

       - Andy.
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